Fig. 1.

Fig. 1. Quality Control (QC) in metabolomics. (A) The score chart of principal component analysis (PCA) analysis for the three samples under both positive and negative ion modes of metabolomics. QC: All quality control samples. A: The control group; B: the GDM group; (B) The diagram of the Correlation for five QC samples under both positive and negative ion modes. (C) The score plot of Orthogonal Partial Least Squares Discrimination Analysis (OPLS-DA) for the metabolites in Con and GDM groups.

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